Communications: electrical – Digital comparator systems
Patent
1974-09-03
1976-04-06
Shaw, Gareth D.
Communications: electrical
Digital comparator systems
340347DD, G06F 314, G06F 700
Patent
active
039493776
ABSTRACT:
Data storage and processing apparatus for storing and processing data for use by a video display monitor. The data storage and processing apparatus includes a random access memory having a general storage section arranged to store data including display character data to be displayed in horizontal display lines on the display surface of a video display monitor and control data for use in conserving storage space in the random access memory. The memory conservation control data contained in the general storage section of the random access memory includes coded spacer characters each of which specifies a spacing operation and a particular number of times that spaces are to be provided consecutively in a line of display data. Each coded spacer character is received and decoded by decoding circuitry coupled to an output of the random access memory. For each decoding of a coded spacer character, the memory is inhibited from any further readout of data characters and a fixed number of coded space characters are caused to be established in an output buffer circuit or until the end of a display line is reached, whichever occurs first. As a consequence, it is required only to store a single coded spacer character in the memory to derive a fixed number of spaces in a display line of the video display monitor rather than to store several coded space characters in the memory.
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patent: 3564512 (1971-02-01), Osborne
patent: 3566361 (1971-02-01), Lavertu et al.
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patent: 3873977 (1975-03-01), McIntosh
Bartz C. T.
Nealon Elmer J.
O'Malley Norman J.
Shaw Gareth D.
Ultronic Systems Corporation
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